Bolster.



M. B. GIBERSON.

BOLSTER.

APrLwATIoN FILED JULY11,1914.

Patented Mar. 23, 1915.

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. v BY www, ,fg/JM ed A TTORIVEY'S THE NORRIS PETERS C04. PHKOTQ-LITHO.. WASHINGTON. D. CA

M. B. GIBERSDN.4

HOLSTER.

APPLICATION FILED JULY 1I, 1914.

' Patented Mar. 23, 1915.

2 SHEETS-SHEET 2.

THE NORRIS PETERS COV. PHON-LITHO.. WASHINGTON. D. C.

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MASON B. GIBERSO-N, OF DETROIT, MICHIGAN, ASSIGNOR TO EIONARCII STEEL CASTINGS l COMPANY, OF DETROIT, MICHIGAN, A CORFORATION OF MICHIGAN.

BOLSTER.

Application filed July 11, 1914.

Be it known that I, MAsoN B. GIBERSON, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Bolsters, of which the following is a specificav tion, reference being had therein to the accompanying drawings.

The invention relates to railway trucks and particularly to the construction of the bolster for transmitting the load to the side frames.

It is the object of the invention to obtain maximum strength with minimum weight,

and to this end the invention consists in the construction as hereinafter set forth.

In the drawings: Figure l is a cross section through a truck frame showing the bolster in elevation; Fig. 2 is a cross section of the bolster on line -m Fig. l; F ig. 3 is a side elevation of a portion of the truck frame showing the bolster in end elevation; and F ig. lis a plan view of thebolster.

A is one of the side frames of the truck, which is provided centrally with an aperture B through which the end of the bolster may be inserted.

C is the bolster, which has an enlarged central portion tapering toward the opposite ends. portion D for receiving the king bolt of the truck, and at the opposite ends are flanges E for slidably engaging vertical guides F on the side frames.

It is usual to form bolsters of a cross section which is either that of an'I-beam or a Copies of this patent may be obtained for ve cents each, by addressing the Washington. D. C.

Specification of Letters Patent.

At the center' is formed a tubular core Imatented Mar. 23, 11.915.

Serial No. 859,450. p box girder; that is with either a central vertical web or two vertical webs at the opposite sides. I4 have found that with the same weight of metal aV much stronger construc' tion may be obtained by forming the-bolster of a cross section having threev vertical webs, one at the center and two at the respective sides. Thus, as shown, G is the central web and G and G2 are the side webs which eX- tend between the top II and the bottom II, being cast integral therewith. These webs may be centrally cut away at I upon opposite sides of the center of the bolster to reduce the weight without weakening the structure. However, the portion of the central web immediately adjacent to the tubular core portion D extends continuously from top to bottom and forms a longitudinal reinforcement for saidA core, while a transverse web .I extending between said core and. the opposite side webs G and G2 form a transverse brace. l

What I claim as my invention is A bolster for railway trucks tapering in a vertical plane from center to opposite ends Y.

MASON t B. GIBERSON.

Vfitnesses:

JAMES I. BARRY, HENRIETTA E. BowMAN.

Commissioner of Patents, 

